Difference between revisions of "Database structure"
From PhotoVoltaic Logger new generation
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m (→pvlng_tree) |
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== pvlng_tree == | == pvlng_tree == | ||
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| + | Channel hierarchy table | ||
The channel tree is organized in a nested set structure. | The channel tree is organized in a nested set structure. | ||
Revision as of 17:28, 10 March 2014
pvlng_type
Channel types table
pvlng_channel
Channels table
pvlng_tree
Channel hierarchy table
The channel tree is organized in a nested set structure.
The nested set model is a particular technique for representing nested sets (also known as trees or hierarchies) in relational databases. Wikipedia:Nested set model
More theory about nested sets.
pvlng_reading_num / pvlng_reading_str
The difference between the reading tables is only the data format for reading values.
The timestamps are not stored as "normal" timestamp type, but as unsigned integer.
It was tested and have significant more performance for consolidated data readouts.
pvlng_babelkit
Here are stored all translations for the web frontend based on the "BabelKit - Multilingual Code Description Lookup Table" [1] project.
